SORPTION OF LEAD (II) IONS BY DIOCTAHEDRAL SMECTITE FROM AQUEOUS SOLUTIONS
Rubrics: 1. CHEMISTRY
Authors:
1.
Mari State University
2.
Mari State University
3.
Mari State University
4.
KNITU
Type:
Article
Pages:
from 18
to 22
Status:
Published
Received:
31.01.2026
Accepted:
31.01.2026
Published:
31.01.2026
Language:
Russian
Keywords:
SORPTION, PB(II), SMECTITE, DEGREE OF EXTRACTION, SORPTION ISOTHERM, LIMITING SORPTION, EFFECTIVE SORPTION ENERGY, LANGMUIR MODEL, DUBININ-RADUSHKEVICH EQUATION
Abstract:
The sorption properties of dioctahedral smectite, a natural enterosorbent, were studied for lead(II) ions from aqueous Pb(NO3)2 solutions. The specific surface area of the sorbent, the sorption-desorption equilibrium constants (Langmuir constants), and the effective activation energy were calculated. The applicability of the Langmuir and Dubinin-Radushkevich sorption models for approximating experimental isotherms, as well as the consistency of the processing results when using them, are demonstrated. The values of the "effective activation energy" parameter within the Dubinin-Radushkevich model allow us to attribute the overall sorption process in the system under consideration to physical sorption, determined by the predominance of reversible sorbent-sorbate interactions due to the small proportion of groups with high chelating capacity, as well as groups capable of ion exchange. High values of the degree of extraction of Pb(II) ions (about 90% at an initial concentration of 10-5 M), as well as the rates of achieving sorption-desorption equilibrium in the system of dioctahedral smectite - aqueous solution of lead(II) nitrate, were experimentally revealed.
The sorption properties of dioctahedral smectite, a natural enterosorbent, were studied for lead(II) ions from aqueous Pb(NO3)2 solutions. The specific surface area of the sorbent, the sorption-desorption equilibrium constants (Langmuir constants), and the effective activation energy were calculated. The applicability of the Langmuir and Dubinin-Radushkevich sorption models for approximating experimental isotherms, as well as the consistency of the processing results when using them, are demonstrated. The values of the "effective activation energy" parameter within the Dubinin-Radushkevich model allow us to attribute the overall sorption process in the system under consideration to physical sorption, determined by the predominance of reversible sorbent-sorbate interactions due to the small proportion of groups with high chelating capacity, as well as groups capable of ion exchange. High values of the degree of extraction of Pb(II) ions (about 90% at an initial concentration of 10-5 M), as well as the rates of achieving sorption-desorption equilibrium in the system of dioctahedral smectite - aqueous solution of lead(II) nitrate, were experimentally revealed.
Keywords:
SORPTION, PB(II), SMECTITE, DEGREE OF EXTRACTION, SORPTION ISOTHERM, LIMITING SORPTION, EFFECTIVE SORPTION ENERGY, LANGMUIR MODEL, DUBININ-RADUSHKEVICH EQUATION
SORPTION, PB(II), SMECTITE, DEGREE OF EXTRACTION, SORPTION ISOTHERM, LIMITING SORPTION, EFFECTIVE SORPTION ENERGY, LANGMUIR MODEL, DUBININ-RADUSHKEVICH EQUATION
